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Middleware for Robotics: a Survey

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Middleware for Robotics: a Survey Middleware for Robotics: A Survey Nader Mohamed, Jameela Al-Jaroodi, and Imad Jawhar The College of Information Technology United Arab Emirates University Al Ain, P.O. Box 17551, UAE, {nader.m, j.aljaroodi, ijawhar}@uaeu.ac.ae Abstract—The field of robotics relies heavily on various meets the design and implementation of different challenges of technologies such as mechatronics, computing systems, and robot technologies is a novel approach to resolve many of the wireless communication. Given the fast growing technological open issues and drastically enhance the development of progress in these fields, robots can offer a wide range of applications on such systems. applications. However real world integration and application development for such a distributed system composed of many Some research efforts have been done on surveying different robotic modules and networked robotic devices is very difficult. aspect of robotics. [1] surveyed space robotics. [2][3] focused Therefore, middleware services provide a novel approach more on robot programming environments characteristics and offering many possibilities and drastically enhancing the evaluations. [4] focused on surveying vision for mobile robot application development for robots. This paper surveys the navigation, while [5] presented different robotic mapping current state of middleware approaches in this domain. It techniques. In addition, some research efforts were conducted on discusses middleware challenges in these systems and presents surveying different middleware approaches for emerging some representative middleware solutions specifically designed technologies such as ad hoc networks [6] and wireless sensor for robots. The selection of the studied methods tries to cover networks [7]. However, none of the existing work investigated most of the middleware platforms, objectives and approaches the current state of research on the design and development of that have been proposed by researchers in this field. middleware for robotics. In this paper, we explore different important middleware projects for robotics, and provide a Keywords—robots, middleware, robot system integration discussion of these approaches. I. INTRODUCTION The remainder of the paper is structured as follows. Section II provides a short overview of robotic applications and outlines the The advances of technology in computing, wireless most relevant challenges that face a middleware design for communication, mechatronics, and sensor technologies is robotics. In Section III, we describe several research projects in pioneering an emerging field of robotics, and offering an middleware for robotics. Section IV, is a discussion of the unprecedented opportunity for a wide array of real time different approaches used and some open research issues. Section applications. Examples of these new applications are Search-and- V concludes the paper. rescue (SAR) missions in dangerous environments or inaccessible terrains, human-assistance for the elderly or physically challenged, and medical/surgical robots. Future robots for II. MIDDLEWARE CHALLENGES FOR ROBOTICS upcoming applications should be modular for easy and rapid While the older generations of robots were designed to implementation, flexible, maintainable, customizable, self achieve specific tasks and manufactured as one unit, the new configuring, self-optimizing, and able to interact with other generations of robots are usually ubiquitous and autonomous. systems like senor networks and enterprise information systems. This is achieved by using modular design and implementation. New robots are composed of heterogeneous interconnected Modern robots are considered complex distributed systems hardware components. These components are usually controlled consisting of a number of integrated hardware and software by software modules developed by different manufactures using modules. The robot's modules cooperate together to achieve different programming languages. These components may also specific tasks. These modules are sensors, actuators, and use different communication mechanisms. Software modules are controllers. Due to their tight integration to the physical world and also needed to process sensor information and control actuators unique characteristics, robots in general pose considerable for performing computational, vision and cognitive tasks like impediments and make the development of robotic applications planning, navigation, and user interaction. non-trivial. There must be new software services that glue all of the components together in an efficient manner, supporting Although modular design has many advantages in concurrency-intensive operations and insuring robustness and engineering, it raises some integration issues such as modularity. A friendly user programming interface that executes communication, interoperability, and configuration. These issues applications and marshals the high level constructs of the could be solved by using a middle layer, middleware. In general, programming language to the low level constructs understandable middleware systems are used in distributed systems to reduce to the operating system should be provided. The middleware development time and cost. This is achieved by providing well- should be customizable to different scenarios, applications and structured and well-tested services for often-needed environments it should also be self-configuring, self-adapting, and functionalities. In addition, it provides some value added self-optimizing. Indeed the need for a middleware layer that fully functions that can not be added to the operating systems such as 978-1-4244-1676-9/08 /$25.00 ©2008 IEEE RAM 2008 reliability, security, and abstraction. However, the design and III. DIFFERENT MIDDLEWARE FOR ROBOTICS development of a successful middleware for robots is not trivial. As mentioned above, several researchers and research groups It needs to deal with many challenges dictated by robots are working on middleware solutions for robotics. Some design characteristics on one hand and the applications requirements on principles and research projects have already been proposed and the other hand. These challenges are the following: implemented, while others offer conceptual models and • Simplifying the development process: application development is frameworks for the proposed middleware. In this section, which is not easy for the robotic environment. Middleware should simplify the focus of our paper, different approaches and projects will be the development process by providing higher-level abstractions presented. However, due to the size restrictions, we will limit the with simplified interfaces that can be used by developers and the detailed descriptions to some projects that we view as more middleware should also enhance software integration and reuse. representative of the issues in discussion. • Support communications and interoperability: robotic modules A. Miro can be designed and implemented by different manufactures. Miro [8][9] is an object-oriented middleware for robots Efficient communication and simple interoperability mechanisms developed by University of Ulm, Germany. The main motivation are needed among these modules. Therefore, robotic middleware of using object-oriented middleware is to improve the software should provide these functions. development process for mobile robots and to enable the • Providing efficient utilization of available resources: robots interaction between the robots and enterprise information usually need to execute processing- and communication-intensive systems. Miro is designed and implemented by applying object- tasks in real-time. Examples are vision processing, mapping, and oriented design and implementation approaches using the navigation. Therefore, efficient utilization of robot components and common object request broker architecture (CORBA) standard. resources is needed. The robots may have single or multiple This allows inter-process and cross-platform interoperability for microprocessors, one or more interconnection networks and distributed robot control. Miro is constructed using three layers: several other resources. Middleware should help in efficiently the device, the service, and the class framework. The device layer utilizing these resources for different application requirements. • provides object-oriented interface abstraction for all sensor and Providing heterogeneity abstractions: any robotic system contains actuator devices. This layer is platform-dependant. The service many heterogeneous hardware and software components. layer provides abstractions for devices via CORBA interface Communication and cooperation among these components is an definition language (IDL). The class framework provides a important aspect. Commonly the abstraction of this role is played number of often-needed services such as mapping, self by a middleware which acts as a collaboration software layer localization, behavior generation, path planning, logging, and among all involved modules, hiding the complexity of the low- visualization facilities. The layered architecture and object- level communication and the heterogeneity of the modules. • oriented approach make Miro very flexible and expandable to Supporting integration with other systems: New types of robots support new devices and new services for new robot applications such as ubiquitous robots need to interact with other systems such [10]. Miro was implemented using multiplatform libraries for as other robots, wireless sensor
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